linux-kernel - [PATCH 5.4 091/155] perf probe: Fix to delete multiple probe event

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Date:   Tue, 31 Mar 2020 10:58:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnaldo Carvalho de Melo <acme@...nel.org>,
        He Zhe <zhe.he@...driver.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH 5.4 091/155] perf probe: Fix to delete multiple probe event

From: Masami Hiramatsu <mhiramat@...nel.org>

commit 6b8d68f1ce9266b05a55e93c62923ff51daae4c1 upstream.

When we put an event with multiple probes, perf-probe fails to delete
with filters. This comes from a failure to list up the event name
because of overwrapping its name.

To fix this issue, skip to list up the event which has same name.

Without this patch:

  # perf probe -l \*
    probe_perf:map__map_ip (on perf_sample__fprintf_brstackoff:21@
    probe_perf:map__map_ip (on perf_sample__fprintf_brstackoff:25@
    probe_perf:map__map_ip (on append_inlines:12@...l/machine.c in
    probe_perf:map__map_ip (on unwind_entry:19@...l/machine.c in /
    probe_perf:map__map_ip (on map__map_ip@...l/map.h in /home/mhi
    probe_perf:map__map_ip (on map__map_ip@...l/map.h in /home/mhi
  # perf probe -d \*
  "*" does not hit any event.
    Error: Failed to delete events. Reason: No such file or directory (Code: -2)

With it:

  # perf probe -d \*
  Removed event: probe_perf:map__map_ip
  #

Fixes: 72363540c009 ("perf probe: Support multiprobe event")
Reported-by: Arnaldo Carvalho de Melo <acme@...nel.org>
Reported-by: He Zhe <zhe.he@...driver.com>
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: stable@...r.kernel.org
Link: http://lore.kernel.org/lkml/158287666197.16697.7514373548551863562.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index 0f5fda11675f..8c852948513e 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -206,6 +206,9 @@ static struct strlist *__probe_file__get_namelist(int fd, bool include_group)
 		} else
 			ret = strlist__add(sl, tev.event);
 		clear_probe_trace_event(&tev);
+		/* Skip if there is same name multi-probe event in the list */
+		if (ret == -EEXIST)
+			ret = 0;
 		if (ret < 0)
 			break;
 	}